Washington (AFP) - The International Monetary Fund on Friday announced a minimum interest rate on its unique SDR currency as it fights off the impact of sagging interest rates and deflation from major economies.The IMF said that from Monday it would maintain a floor rate of 0.05 percent, or five basis points, on its special drawing rights or SDR currency, which represents a basket of the currencies of its largest members.Currently the rate the Fund pays on the money its members lend to it is 3 basis points.